Arrow 2EC Herbicide - 1 Gallon Arrow 2EC application rate is 12-16 Ounces per acre For small batch spot spray use approx. 1/2-1 oz. per gallon of water Use Charge SOC (Crop Oil replacement) with Arrow 2EC at 2 Qts/100 gallons of water or 1 Pt/25 Gals of water. (3/4 oz per gallon water) Rainfast after 1 Hour